Column 3 of triangle A112911.

Terms

a(0) =1a(1) =4a(2) =24a(3) =176a(4) =1492a(5) =14220a(6) =149812a(7) =1724760a(8) =21519108a(9) =289101836a(10) =4160750192a(11) =63873461064